微弱应变测量传感器设计及应用

Design and application of weak strain measurement sensor

通过对现有磁致伸缩系数测量方法的分析,提出了一种非平衡电桥法测定磁致伸缩系数的新方法,并设计制作了微弱应变测量传感器,获得了温度在295 K时铁—镓(Fe-Ga)合金材料在0~60 m T磁场中的关系曲线,并建立了磁致伸缩系数与磁场的关系公式。实验结果表明:传感器能够稳定和精确地获取磁致伸缩系数,为精确测量磁致伸缩材料在磁场中的变化特性开辟了新途径,在一定程度上,解决了当前实验仪器研究中存在的超微弱信号极难测量和稳定性的问题,为以后相关仪器的研究提供了范例,可作进一步推广。

Through analysis on existing magnetostriction coefficient measurement method,a method of nonbalanced electric bridge is proposed to determinatie magnetostrictive coefficient,and in accordance with the method,design weak strain measurement sensor.Using it obtain relationship curve of the Fe-Ga alloy material in a magnetic field of 0~ 60 m T when it is at the temperature of 295 K,and establish a relation formula of magnetostriction coefficient and magnetic field. The experimental results show that the sensor can stably and precisely acquire the magnetostriction coefficient,for precisely measuring the changes characteristics of the magnetostrictive material in the magnetic field open up new avenues,while to some extent,the works solves the problem that a weak signal in the current study of laboratory instruments is extremely difficult to measure and stability,and provides an example for afterward study of the related instrument and it can be promot ed further.